I'm mostly wondering because my previous Magnavox era V-series Ampeg had a lot of issues and was constantly in the shop, and I'd like to avoid that if possible.
That's unusual, Magnavox era Ampegs are generally very reliable amps. Of course, along the lines of buzzsunn's post, vintage amps are very similar to vintage sports cars; staying on top of required maintenance is just part of the experience.
Another issue might be the tech you are using, and what you are actually asking that tech to do, e. g.; if you are just asking (and willing to pay for) to have the amp "fixed", or if you are having a qualified tech "make it right".
The "band-aid, only fix what breaks" concept can certainly cause the issues you are complaining about with your V22.
Like the old sports car example, sometimes "fixing" an amp can actually cause other components to fail in short order. Replacing a water pump in an old car can cause a "solid" heater hose or heater coil to fail shortly afterwards because of increased pressure, and a power supply restoration/upgrade on an amp can have a similar effect on components down the signal path.
These are just two examples; there are myriad situations
like this that can crop up with both old cars and old amps.
Regardless, and in spite of the fact that many players indeed own untouched, "bulletproof" vintage amps, if you don't want to recognise and deal with the ongoing maintenance associated with old amps, you are probably better off $tepping up for a boutique piece, or just buying dirt cheap disposable Asian import amps every few years.
BTW; that's not a slam on Asian amps. IMO cheap, "throwaway" gear is a viable option, and likely makes the most sense for the majority of casual players; just like a brand new Hyundai makes much more sense than a vintage 911 for the majority of casual drivers.